Yazzo is a generalized system of interconnected pieces. You might consider them to be like Legos, or Klikko, or similar builder sets. What this thing does is help you integrate your electronics projects into the Yazzo build system. Basically, take your board, whether it has mounting holes or not, and slide it into one of these harnesses. Once in the harness, you can mount the harness to other parts of the Yazzo system using connectors such as these http://www.thingiverse.com/thing:4834 What's particularly fun might be the Toy Panel http://www.thingiverse.com/thing:4828

Update: 22 Nov 2010
Update design to include rounded edges, so it's printable without support material. Also is more grippy on the board.
Added a few new harnesses, increased width on a few of them.

Multiple Toy Panels, with harnessed electronics attached can be assembled into really neat things.

1) Print a harness that fits your particular electronics
2) Slide your electronics board into the harness
3) Rejoice!

If you are into OpenScad, then you can easily create a harness to fit any size PCB that you so happen to have.

Once you print the harness and assemble, you can attach your Yazzo harness to another piece of Yazzo, and form neat things.